Using the Postoffice Address List

If you use Outlook as your email client on a corporate mail server, many of the messages you send will be to coworkers on that same network. The email addresses for these people will be determined by your network administrator. Outlook can also be set up to serve as your Internet email client.

Internet email

Internet email is sent over the Internet by means of a modem or your corporate network. Internet email addresses usually take the form of username@company.com.